Handsaw



MarchA 11, 1930. w. HUQKING'HAUS HANDSAW Filed July 8, 1929 lnyen for a fz/few?" Patented Mar. 11, 1930 UNITED STATES WILHELM HCKINGHAUS, OF REMSCHEID, GER-MANY HANDSAW Application filed .Tuly 8, 1929, Serial No. 376,552, and in Germany January 7, 1927.

The invention relates to the known handsaws with wooden han-dle and stiff saw-blade, in which between the handle and the sawblade a connecting bridge piece or tie-piece of sheet-metal is employed. The tie-pieces commonly used are so shaped and attached to the wooden handle and saw-blade that an aperture closed at all points except at the sides is formed for the reception of the hand,

and such tie-pieces are not adapted for use upon certain types of saws, for example, keyhole, compass and like saws.

In contra-distinction thereto the invention provides a tie-piece which consists of sheet-metal folded so as to be of U-section, the middle-part of which is pressed together so as to form a flat shank while the blade and handle engaging ends are respectively formed to embrace the saw-blade and engage slots formed in the handle, to which blade and handle they are secured by means of fastening pins or rivets.

Owing to this design the bridge or tiepiece possesses apart from eXtreme simplicity, the advantage of a durable and substantial construction. Moreover, in consequence of its peculiar formation and disposition, its attachment to any kind of saw-blade, including key-hole, compass and like saws, is rendered possible. Furthermore, the new tiepiece embodies the advantage, that it may be produced by a suitable machine in one working operation an-d that it may be secured 1n a simple manner in a slotted handle, wherein the slot is so formed, that it in no way weakens the wood of which the handle is made.

Two examples of performance have been represented in the drawing, in which Fig. l represents a hand-saw with hand receiving aperture closed at top and base, and

Fig. 2 a sectional view on the line A-A of Fig. l.

Fig. 3 illustrates a saw with hand receiving aperture closed at the base, while Fi l is a sectional view along the line B- of Fig. y3. i

In the drawing a represents the stiii' sawblade of a hand-saw, to the rear-end of which the wooden handle c is secured through the medium of a connection comprising two metal tie-pieces b', b". The handle c is so fashioned as to permit it to be conveniently gripped and is made from wood the grain of which runs in a longitudinal direction, thereby providing a handle which opposes a considerable resistance to fracture.

In Fig. l the saw is provided with a handle c connected at top and bottom to the saw blade by metallic tie-pieces b', b. In ac` cordance with the invention each tie-piece b', ZJ consists of a sheet-metal strip presenting a central arched shank and saw and handle engaging ends, said strip being channeled or folded upon itself so as to present a U-section, 'each tie-piece in structure comprising two side plates connected at their outer longitudinal edges by a bridge plate f. The concaved or arched inner edges of the central shanks s of the bridge pieces, which define with the opposed surface of the saw and handle the aperture intended for the reception of a portion of the hand, are pressed together in such a manner as to prevent the formation of sharp edges and to close the channeled portions of the Shanks and thus strengthen the latter. The saw-blade is embraced by the forward attaching end of each tie-piece and held between the jaws g thereof, the edges of said jaws g being bent inwardly to form flanges Zz, bearing against the blade. Each jaw g is provided with an instruck clamping portion i which is pressed with the iianges 7L firmly against the saw blade The tie-pieces b are secured to the saw blade by means of rivets p passing through the blade and the instruck portions z'.

The rear handle engaging end of each tiepiece b', b is shaped to form flanges m, o. These flanges m, o are let into kerfs, grooves or mortices 1 cut into the handle c by means of a thin circular saw and safely secured thereto by means of cross rivets g. The kerfs or grooves 1' are disposed parallel with each other in accordance with the distance between the ianges of the sheet-metal strip, i. e., leaving a sufficiently wide interval, so that the cross-section and with it the resisting power of the wooden handle is in no way i111- paired. The firmness of the attachment of the tie-pieces to the wooden handle is enhanced by reason of the fact that the ends ot' the bridge plates bear against both the blade and the handle c.

Figs. 3 and 4 represent a hand-saw with so-called open handle. The design and disposition OJ' the handle corresponds in its details with the construction as per Figs. l and 2 described above with the difference, that instead of the two tie-pieces ZJ, b, only a single tie-piece (d) is employed with attachment portions g, m, o between the sawblade a and the wooden handle c, the shank s extending between the blade and handle across the tops oi the hand receiving aperture, such aperture being thus open at the base as well as the sides, as isnecessary in key-hole, compass and other like types of saws.

I claiin:

In a handle for saws, a saw blade, a handle having a concavely curved front edge extending between its top and bottom edges and oi' a depth substantially equal to the depth of the rear edge of the saw blade, said curved edge of the handle being formed with a pair of parallel kerfs opening only through said curved edge of the handle and closed at their upper and lower ends, and a tie-pece connecting the blade and the handle and com prising a pair of rear parallel plates engaging the kei-fs of the handle,.a pair of front parallel plates lying on opposite sides of the rear end of the saw blade', a pair ofrarched intermediate plates forming a shank uniting the riore-mentioned plates, and a top plate closing the spaces between the front plates and the intermediate plates, said intermediate plates having inbent flanges closing the space between them at `their lower edges and said front plates having inbent marginal iianges and instruck intermediate portions bearing against the faces of the saw blade, rivets passing through the handle and rear pair of plates and uniting the saine, and rivets passing through the saw blade and instruck intermediate port-ions of the front plates and uniting the same.

In testimony whereotl I aix my signature.

WILHELM HCKINGHAUS.

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